Trimming attachment for machines for sewing looped fabrics



(No Model.) 4Sheets-Sheet 1.-

A. F. CHAMPLIN.

TRIMMING ATTAGHMENT FOB. MACHINES FOR SEWING LOOPEDFABRI-GS.

No. 421,550. Patented Feb. 18,1890.

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14572755555. hive/7mm- (No Model.) 4 Sheets-Sheet 2.. I

A. P. OHAMPL'IN. TRIMMING ATTACHMENT FOR MACHINES FOR SEWING LOOPEDPABRIGS.

. Patented Feb; 18,1890.

N. PETERS. Phulwlhhogmphan Washingtnn. D. C.

4 Sheets- Sheet 3,

(No Model.)

A. F. OHAMPLIN. TRIMMING ATTACHMENT FOR MACHINES FOE SEWING LOOPEDFABRICS.

No. 421,550. Patented Feb. 18, 18-90.

@mw W/y (NoM'odell) 4 Shets-Sheet 4.

A. P. OHAMPLIN. TRIMMING ATTACHMENT FOR MACHINES FOR-SEWING LOQPEDFABRICS.

NO. 421,550. Patented Feb; 18, 1890-.

N PETERS. PMkvUtMgmpMr, Wnhlnglun. D. C.

ing toward the left.

NITED AMOS F.'CHAMPLIN, OF GRANBY, CONNECTICUT.

' TRIMMING ATTACHMENT FOR MACHINES FOR SEWING LOOPED FABRICS.

SPECIFICATION forming part of Letters Patent No. 421,550, dated February18, 1890.

Application filed April 8, 1889, Sen'al No. 306,294. (l lo model.)

To all whom it may concern:

Beltknown that I, AMOS F. CHAMPLIN, a citizen of the United States,residing at Granby,

In the accompanying drawings, Figure 1 is a plan View of the frame of mytrimming attachment, together with aportion of the looping-maohinetowhich it is attached. Fig. 2 is a vertical section of the same, (partlyin ele vat-ion,) the plane of section being indicated by the line was ofFig. 1. Fig. 3 is a plan view of my said attachment as detached from themachine. This and all thefollowing figures, except Fig. 8, are on anenlarged scale. Fig. 4 is a front elevation of said attachment. Fig, 5is a transverse section thereof onthe line fl/ 1 of Fig. 3, looking tothe right, the rocking arm in front of said section being indicated bybroken lines. Fig. 6 is a like View of the same with the parts in adifferent position. Fig. 7 is a detached view, partly in verticalsection, showing the supplemental shear blades and their operatingmechanism, look- Fig. 8 is a detached side elevation, looking in thesame direction, and showing the knife-arm and adjustable bearing-arm atthe right-hand end of the rockshaft; and Fig. 9 is a perspective view ofmy trimming attachment .and its driver.

A designates a stationary circular head, upon the edge of which theannular rim (which is usually termed the pin-wheel) B is mounted torevolve, said pin-Wheel being held down upon the head A by means of thering 8 and revolved intermittently in the ordinary manner. Said head Ais also provided with the ordinary needle plate C, at which point thesewing is done.

The sewing mechanism is not shown.

D designates the frame of my trimming attachment, which is adj ustablymounted upon brackets 9 9, that are secured to the head A, as shown inFigs. 1 and 2. These brackets are designed to set inside of the ring 8,and the frame is adjustable up and down on said brackets by means ofscrews 10, that pass through slots in said brackets, whereby the frameof the trimming attachment may be secured to previously constructedmachines and brought down into proper position immediately over the pins11 of the pin-wheel B, as most clearly shown in Fig. 2.

12 designates a rock-shaft through which my trimming attachment isoperated. In the present instance I have shown a rocking arm 13,pivot-ed to the frameB at 14: andconneoted with the shaft 12 by means ofa pitman 15 and rocking arm 16, and I have also provided the swingingend of the rocking arm 13 with a push-pawl bar 17, which may be actedupon to push the rocking arm 13 intermittently by any known mechanism.An example of a proper mechanism for this purpose is shown and describedin a prior application, filed by me December 24, 1888, and designated asSerial No. 294,534; but other mechanism for actuating the rocking arm12may be substituted therefor without in any way modifying my presentinvention, which relates. to the trimming-attachment frame and the partswhich are operated through the rocking shaft 12. In Fig. 9 I have,however, shown the driver Gin proper position, the same to be mountedupon an oscillating shaft, as indicated by broken lines at K. Therocking shaft 12 is returned to its position, after being actuatedthrough the rocking arm 16,by means of the spring 18, one end of whichis attached to the frame and the other to the rocking arm 19 at theright-hand end of the shaft 12. The front of the frame at its lowerportion and front edge is preferably provided with a throat-plate 20,within the throat of which the knife 21 on the rocking arm 22 Works assaid arm vibrates with the motion of the rocking shaft 12. This knife issharpened at its upper edge and enters the loops of the fabric, which itcuts over every alternate pin of the pinwheel, as in my aforesaidapplication. My presentimprovement relates mainly On the front end ofsaid picker-arm I arrange the picking-fingers 20 27, both pivoted on acommon axis at 28. The pickingfinge1' 27 has a rearwardly-extendingshank 29, and the picking-finger 20 has a forwardly-extending shank atits upper end, to which the lever 30 is pivoted, as shown most clearlyin Figs. 5 and 6. The front end of this lever 30 bears upon anadjusting-screw 31 in the picker-arm 24, while the opposite end of saidlever bears 011 the upper edge of the rearwardly-projecting shank 29 ofthe pickingfinger 27, as shown in Figs. 5 and (J. A light spring 32bears upon the upper edge of the lever 30 to insure its proper working.The picker-arm 24 is also provided with an adjustable stop 33, the samepassing through a threaded hole in said picker-arm and preferablyprovided with a set-nut 3% for holding the stop in its adjustedposition. The lower endof this stop rests upon a forwardly-projectinglug 35, formed on the adjustable bearing-arm 36 for the shaft 12 at theright-hand end of said shaft. Said adjustable bearing 36 is made in theform of an angle-arm and pivoted to the lug I-l upon the frame D, withits downwardly-projecting member between the ends of the twoadjusting-screws 45 4:5, by means of which that end of the rock-shaftmay be adjusted so as to raise or lower the cutter, as may be desired.

Upon the rock-shaft 12, I arrange a rocking arm 37, which is indicatedby broken lines in Figs. 5 and 6, which arm bears upon its rear end theprojection 38, for contacting with the lower edge of the shank 20 of thepicking-finger 27, whereby a rocking upward motion of said projection 38first closes the picking-fingers and then carries them bodily upward,raising the front end of the pickerlever with them.

39 designates a guard or waste-pan of an ordinary construction forcatching the parts trimmed off and guiding them in a direction to fallfrom the machine. Underneath said pan I attach a supplementary cutterconsisting of fixed and movable shear-blades 4L0 and 41, withtheir-cutt-in g edges located just above the horizontal plane of thepins that carry the work and with the line of cut as they shut togetherin the same vertical plane as the work on said pins, the movable blade41 being actuated by means of its upper end resting within a slot 42 ofthe rocking arm 43 on the rock-shaft 12, as most clearly shown in Fig.7.

As in other machines of this class, the work to be trimmed and sewed isarranged upon the pins of the phrwheel, and the pin-wheel driven with anintermittent motion. As the knife and knife-arm are forced inwardly fromthe operator under the operatingmechanism, the point of the knife entersthe loops immediately above those upon that pin of the pinwheel that isunderneath the knife, and thereby cuts the threads composing said loops.As the next succeeding loops are pre sented the knife is idle, but atthe second pin it acts again to cut the loops, and so on, repeatedlyleaving a section of uncut loops between each cut of the knife. At thesame time that the knife makes its inward movement the projection 38 011the rocking arm 37 bears upon the under edge of the shank 29 and bringsthe picking-fingers 26 and 27 together with the uncut loops betweenthem. If the PIGkGP-Iill'lgOlS are not at the proper height to graspsaid loops, they may be adjusted by the stop If they do not meet eachother at a point coincident with the loops upon the pin-wheel, theadjusting-screw 31 may be turned so as to cause the fingers to meet eachother at a point farther to the front or rear, and thereby bring them inproper relation to the loops. After the fingers come together theprojection 38 on rocking arm 37 continues its upward movement, and assaid fingers cannot yield said rocking arm carries the closed fingersand front end of the pickers-rm 24E upwardly into the position shown inFig. 6. In Fig. 5 they are shown in their lowermost position and open.The rocking arm 37 returns amlpermits the fingers to descend and openagain, thereby dropping the loops pulled out by them, so that saidlingers are ready to repeat the operation of picking out the successivecut sections after they have been cut by the knife-arm and presented tosaid fingers by the pinwheel. If for any reason-as, for instance,improperly placing the work upon the pinwheel any of the threads orportions of them remain uncut after passing the knife 21,-thesupplemental cutters eiO and 41 will cut elf such remaining portions,inasmuch they are so located that any uncut fabric or portion thereofthat projects above the loops on the pins of the pin-wheel will by themove ment of said wheel be brought between said cutters; but when thereare no such uncut projecting portions there will be nothii'ig for thesupplemental cutters to cut.

I claim as my invention-- 1. In a trimming attachment for loopingmachines, the combination of aprincipal cutter-as, for instance, theknife 2l--the supplemental cutters consisting of shear-blades 40 41, andoperating mechanism, substantially as described, and for the purposespecified.

2. In a trimming attachment for looping machines, the combination of therocking knife-arm 22, knife 21 mount-ed thereon, the picker-arm 24,pivoted on the frame with its length extending in a direction parallelto the stroke of said knife-arm, a pair of pickingfingers pivoted tosaid picker-arm, and operating mechanism, substantially as described,and for the purpose specified.

The combination of the picker arm 2i, pivoted to the frame 1), thepicking-fingers 26 and 27, pivoted on a common center at the swingingend of said arm, and operating mechanism, substantially as described,and for the purpose specified.

4-. The combination of the picking-lingers 26 and 27, pivoted togetheron a moving supportas, for instance, the arm 24and each provided Withshanks extending from their pivot, the lever 30, pivoted to one shank ofsaid fingers with one end bearing upon the shank of the other finger,the adjusting screw 31 in said support, the opposite end of said lever30 resting upon saidscrew, and operat-- ing mechanism acting upon one ofsaid finger-shanks, substantially as described, and for the purposespecified.

5. The combination of the moving pickerarm 24, the picking-fingers 26and 27 pivoted thereon, the lever 30, pivoted to the shank of one fingerand resting at one end upon the shank of the other finger and at theother end on the said arm, the rocking-arm 37, having the projection 38,and operating mechanism whereby the fingersare first brought to-. getherand thenmoved upwardly, substantially as specified.

6. The combination of a frame, the pickerarm 24, picking-fingers 26 and27 mounted thereon, the adjustable stop 33, a support on the frame forsaid stop to engage, and operating mechanism, substantially asdescribed, and for the purpose specified.

7. The combination of a frame, the pickerarm 24,picking-fingers 26 and27 mounted thereon, the lever 30, pivoted to the shank of onepicking-finger and bearing at one end upon the shank of the otherfinger, the adjusting-screw 31 in said arm 24, upon which screw one endof the lever 30 rests, the adv justable stop 33, a support on the frameforsaid frame, the picker-arm 24, picking-fingers 26 and 27, theadjustable stop for regulating the fall of said fingers, adjustingdevices to regulate the closing of said fingers, and operatingmechanism, substantially as described, and for the purpose specified.

' AMOS F. CI-IAMPLIN.

Witnesses:

JAMES SHEPARD, JOHN EDWARDs, Jr.

